Water-tube boiler.



No. 765,830. PATBNTED JULY 26, 1904. R. GRAY.

WATER TUBE BOILER.

APPLIUATION FILED 001:20, 1902.

N0 MODEL.

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UNiTED STATES Patented J' u1y 26, 1904.

PATENT OFFICE.

ROBERT GRAY, OF LOIVELLVILLE, OHIO, ASSIGNOR TO THE MEEHAN BOILER tCONSTRUCTION COMPANY, OF LOVVELLVILLE, OHIO, A

CORPORATION OF OHIO.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent N0. '7 65,830, dated July26, 1904.

Application iiled October 20, 1902.

T0 @ZZ whmn t may concern:

Be it known that I, ROBERT GRAY, of Lowellville, Mahoning county, Ohio,have invented a new and useful VVater-Tube Boiler, of which thefollowing' is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specilication, inwhich- Figure l is a sectional end elevation of my improved boiler; andFig. 2 is a side elevation, partly broken away, showing the sameattached to a heating-furnace.

My invention relates to boilers of the vertical water-tube type, and isdesigned to improve such boilers by providing means for drying' orsuper-heating the steam after it leaves the steam and water drum ordrums.

In the drawings I show a boiler having mud-drums 2 2 and a single steamand water drum 3. The steam and water drum is connected with themud-drums by banks of tubes I L1, and the boiler is inclosed inavertical setting or shell 5, which is provided with suitable lining andbaffles. The drums 2 and 3 extend horizontally and are of cylindricalform, their ends preferably extending through the casing, as shown inFig. 2. I have shown the boiler as set in the outlet-flue of thelheating-furnace 6, the waste heat entering the port'T at the bottom andthence rising between the mud-drums and among the tubes and passing outthrough an upper stack 8, having a suitable valve 9.

The parts above described are old in this art, and I make no claimsherein to the boiler itself.

Above the steam and water drum 3 and within the enlarged lower portionof the stack-flue I provide a steam-drum 10, which is connected with theupper part of the steam and water drum by curved tubes ll. These tubesare substantiallyvertical Vand being inserted along the lowest portionof the drum 10 serve to keep it 'continually drained and to preventsaturation of the steam in the superheater-l drum. The drum l() ispreferably of cylindrical form, extending parallel with the drum 3,their axes being approximately in the same vertical plane, the drum l0,however, being Serial No. 127,916. (No model.)

smaller and shorter. The steam-offtake pipe l2 leads from the upper partof the drum 10.

In the operation of the boiler the steam formed in the tubes and drumsrises from the drum 3 through the tubes 11 into the drying orsuper-heating drum 10 and is thence taken to the point of supply. Theheated gases after passing upwardly among the boiler-tubes encircle thetubes 11 and drum 10, and thereby heat the steam therein, thusincreasing its .tubes connecting' it with the steam and water drum ordrums; substantially as described.

2. A vertical water-tube boiler having a single steam and water drum, astack-flue above the same, a superheater-drum in the stack-flue, and aplurality of rows of drum- Y draining tubes connecting thesuperheatingdrum with the steam-space of the steam and water drum, saidtubes presenting a heatingsurface to the gases; substantially asdescribed.

3. A vertical water-tube boiler having a single horizontal cylindricalsteam and water drum, and asimilar superheating-drum above the same inthe stack-flue, and connected with the same by a plurality of rows ofcurved, drum-draining and superheating tubes; substantially asdescribed.

In testimony whereof I have hereunto set my hand.

ROBERT GRAY.

Witnesses:

L. M. REDMAN, H. M. CoRwIN.

